If you must use extenders, make sure you only get ones that are the 'airless' type. Meaning, there is no air pressure in them, except when you put a gauge or air hose on it. That way, there is no risk of your tire leaking air if the extender works loose (because they can and will).
Any other kind of extender that has air pressure in it all the time, and you are asking for trouble, IMO. Been there, done that - Had one of those extenders knocked loose by road debris and leaked out all the air in the tire. Almost cost me a tire, had I not caught it quickly and taken care of it (thank you, Good Sam Roadside service!!)
A much, much better solution, is the complete replacement vales, dually valves, like already mentioned. More expensive, and more work to install, as tires have to be dismounted since its a complete valve stem replacement. But, they make checking, topping off the tires much, MUCH easier, both inner and outer. I have the dually valves, and I can check, inflate ALL the tires on MH and all our other vehicles with the same, simple digital tire gauge. No need for a special truck tire gauge. And, I never have to worry about a valve stem leaking ever again.
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Will and Cheryl
2021 Newmar Baystar 3014 on F53 (7.3 V8) Chassis ("Brook")
2018 Jeep Wrangler JK ("Wilbur")
